The standard electrical dictionary : a popular encyclopaedia of words and terms used in the practice of electrical engineering (1898)
Sloane, T. O'Conor (Thomas O'Conor), 1851-1940 · London : Crosby Lockwood and Son · leaf 525
of two perma-nent magnets. This avoids danger of reversal of polarity fromlightning, a trouble incident to the old system. ^ 520 STANDARD BlvBCTRICAl, DICTIONARY. The cut, Fig. 322, shows a single needle telegraph instrumentof the tapper form. The action of the tapper can be understoodfrom the next…
Electricity
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